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Diffstat (limited to 'lib/ssl/src/ssl_handshake.erl')
| -rw-r--r-- | lib/ssl/src/ssl_handshake.erl | 1609 |
1 files changed, 1609 insertions, 0 deletions
diff --git a/lib/ssl/src/ssl_handshake.erl b/lib/ssl/src/ssl_handshake.erl new file mode 100644 index 0000000000..0f5d5def48 --- /dev/null +++ b/lib/ssl/src/ssl_handshake.erl @@ -0,0 +1,1609 @@ +%% +%% %CopyrightBegin% +%% +%% Copyright Ericsson AB 2013-2013. All Rights Reserved. +%% +%% The contents of this file are subject to the Erlang Public License, +%% Version 1.1, (the "License"); you may not use this file except in +%% compliance with the License. You should have received a copy of the +%% Erlang Public License along with this software. If not, it can be +%% retrieved online at http://www.erlang.org/. +%% +%% Software distributed under the License is distributed on an "AS IS" +%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See +%% the License for the specific language governing rights and limitations +%% under the License. +%% +%% %CopyrightEnd% + +%---------------------------------------------------------------------- +%% Purpose: Help funtions for handling the SSL-handshake protocol +%%---------------------------------------------------------------------- + +-module(ssl_handshake). + +-include("ssl_handshake.hrl"). +-include("ssl_record.hrl"). +-include("ssl_cipher.hrl"). +-include("ssl_alert.hrl"). +-include("ssl_internal.hrl"). +-include("ssl_srp.hrl"). +-include_lib("public_key/include/public_key.hrl"). + +%% Handshake messages +-export([hello_request/0, server_hello_done/0, + certificate/4, certificate_request/3, key_exchange/3, + finished/5, next_protocol/1]). + +%% Handle handshake messages +-export([certify/7, client_certificate_verify/6, certificate_verify/6, verify_signature/5, + master_secret/5, server_key_exchange_hash/2, verify_connection/6]). + +%% Encode/Decode +-export([encode_handshake/2, encode_hello_extensions/1, + encode_client_protocol_negotiation/2, encode_protocols_advertised_on_server/1, + decode_handshake/3, decode_hello_extensions/1, + decode_server_key/3, decode_client_key/3, + decode_suites/2 + ]). + +%% Cipher suites handling +-export([available_suites/2, available_suites/3, cipher_suites/2, + select_session/10]). + +%% Extensions handling +-export([client_hello_extensions/5, + handle_client_hello_extensions/8, %% Returns server hello extensions + handle_server_hello_extensions/9 + ]). + +%% MISC +-export([select_version/3, prf/5, decrypt_premaster_secret/2]). + +%%==================================================================== +%% Internal application API +%%==================================================================== + +%% ---------- Create handshake messages ---------- + +%%-------------------------------------------------------------------- +-spec hello_request() -> #hello_request{}. +%% +%% Description: Creates a hello request message sent by server to +%% trigger renegotiation. +%%-------------------------------------------------------------------- +hello_request() -> + #hello_request{}. + +%%-------------------------------------------------------------------- +-spec server_hello_done() -> #server_hello_done{}. +%% +%% Description: Creates a server hello done message. +%%-------------------------------------------------------------------- +server_hello_done() -> + #server_hello_done{}. + +client_hello_extensions(Version = {Major, Minor}, CipherSuites, SslOpts, ConnectionStates, Renegotiation) -> + {EcPointFormats, EllipticCurves} = + case advertises_ec_ciphers(lists:map(fun ssl_cipher:suite_definition/1, CipherSuites)) of + true -> + ecc_extensions(tls_v1, Version); + false -> + {undefined, undefined} + end, + + HashSign = if + Major == 3, Minor >=3 -> + default_hash_signs(); + true -> + undefined + end, + + SRP = srp_user(SslOpts), + + #hello_extensions{ + renegotiation_info = renegotiation_info(tls_record, client, + ConnectionStates, Renegotiation), + srp = SRP, + hash_signs = HashSign, + ec_point_formats = EcPointFormats, + elliptic_curves = EllipticCurves, + next_protocol_negotiation = + encode_client_protocol_negotiation(SslOpts#ssl_options.next_protocol_selector, + Renegotiation)}. + +%%-------------------------------------------------------------------- +-spec certificate(der_cert(), db_handle(), certdb_ref(), client | server) -> #certificate{} | #alert{}. +%% +%% Description: Creates a certificate message. +%%-------------------------------------------------------------------- +certificate(OwnCert, CertDbHandle, CertDbRef, client) -> + Chain = + case ssl_certificate:certificate_chain(OwnCert, CertDbHandle, CertDbRef) of + {ok, CertChain} -> + CertChain; + {error, _} -> + %% If no suitable certificate is available, the client + %% SHOULD send a certificate message containing no + %% certificates. (chapter 7.4.6. RFC 4346) + [] + end, + #certificate{asn1_certificates = Chain}; + +certificate(OwnCert, CertDbHandle, CertDbRef, server) -> + case ssl_certificate:certificate_chain(OwnCert, CertDbHandle, CertDbRef) of + {ok, Chain} -> + #certificate{asn1_certificates = Chain}; + {error, _} -> + ?ALERT_REC(?FATAL, ?INTERNAL_ERROR) + end. + +%%-------------------------------------------------------------------- +-spec next_protocol(binary()) -> #next_protocol{}. +%% +%% Description: Creates a next protocol message +%%------------------------------------------------------------------- +next_protocol(SelectedProtocol) -> + #next_protocol{selected_protocol = SelectedProtocol}. + +%%-------------------------------------------------------------------- +-spec client_certificate_verify(undefined | der_cert(), binary(), + tls_version(), term(), private_key(), + tls_handshake_history()) -> + #certificate_verify{} | ignore | #alert{}. +%% +%% Description: Creates a certificate_verify message, called by the client. +%%-------------------------------------------------------------------- +client_certificate_verify(undefined, _, _, _, _, _) -> + ignore; +client_certificate_verify(_, _, _, _, undefined, _) -> + ignore; +client_certificate_verify(OwnCert, MasterSecret, Version, + {HashAlgo, SignAlgo}, + PrivateKey, {Handshake, _}) -> + case public_key:pkix_is_fixed_dh_cert(OwnCert) of + true -> + ?ALERT_REC(?FATAL, ?UNSUPPORTED_CERTIFICATE); + false -> + Hashes = + calc_certificate_verify(Version, HashAlgo, MasterSecret, Handshake), + Signed = digitally_signed(Version, Hashes, HashAlgo, PrivateKey), + #certificate_verify{signature = Signed, hashsign_algorithm = {HashAlgo, SignAlgo}} + end. + +%%-------------------------------------------------------------------- +-spec certificate_request(erl_cipher_suite(), db_handle(), certdb_ref()) -> + #certificate_request{}. +%% +%% Description: Creates a certificate_request message, called by the server. +%%-------------------------------------------------------------------- +certificate_request(CipherSuite, CertDbHandle, CertDbRef) -> + Types = certificate_types(CipherSuite), + HashSigns = default_hash_signs(), + Authorities = certificate_authorities(CertDbHandle, CertDbRef), + #certificate_request{ + certificate_types = Types, + hashsign_algorithms = HashSigns, + certificate_authorities = Authorities + }. +%%-------------------------------------------------------------------- +-spec key_exchange(client | server, tls_version(), + {premaster_secret, binary(), public_key_info()} | + {dh, binary()} | + {dh, {binary(), binary()}, #'DHParameter'{}, {HashAlgo::atom(), SignAlgo::atom()}, + binary(), binary(), private_key()} | + {ecdh, #'ECPrivateKey'{}} | + {psk, binary()} | + {dhe_psk, binary(), binary()} | + {srp, {binary(), binary()}, #srp_user{}, {HashAlgo::atom(), SignAlgo::atom()}, + binary(), binary(), private_key()}) -> + #client_key_exchange{} | #server_key_exchange{}. + +%% +%% Description: Creates a keyexchange message. +%%-------------------------------------------------------------------- +key_exchange(client, _Version, {premaster_secret, Secret, {_, PublicKey, _}}) -> + EncPremasterSecret = + encrypted_premaster_secret(Secret, PublicKey), + #client_key_exchange{exchange_keys = EncPremasterSecret}; + +key_exchange(client, _Version, {dh, PublicKey}) -> + #client_key_exchange{ + exchange_keys = #client_diffie_hellman_public{ + dh_public = PublicKey} + }; + +key_exchange(client, _Version, {ecdh, #'ECPrivateKey'{publicKey = {0, ECPublicKey}}}) -> + #client_key_exchange{ + exchange_keys = #client_ec_diffie_hellman_public{ + dh_public = ECPublicKey} + }; + +key_exchange(client, _Version, {psk, Identity}) -> + #client_key_exchange{ + exchange_keys = #client_psk_identity{ + identity = Identity} + }; + +key_exchange(client, _Version, {dhe_psk, Identity, PublicKey}) -> + #client_key_exchange{ + exchange_keys = #client_dhe_psk_identity{ + identity = Identity, + dh_public = PublicKey} + }; + +key_exchange(client, _Version, {psk_premaster_secret, PskIdentity, Secret, {_, PublicKey, _}}) -> + EncPremasterSecret = + encrypted_premaster_secret(Secret, PublicKey), + #client_key_exchange{ + exchange_keys = #client_rsa_psk_identity{ + identity = PskIdentity, + exchange_keys = EncPremasterSecret}}; + +key_exchange(client, _Version, {srp, PublicKey}) -> + #client_key_exchange{ + exchange_keys = #client_srp_public{ + srp_a = PublicKey} + }; + +key_exchange(server, Version, {dh, {PublicKey, _}, + #'DHParameter'{prime = P, base = G}, + HashSign, ClientRandom, ServerRandom, PrivateKey}) -> + ServerDHParams = #server_dh_params{dh_p = int_to_bin(P), + dh_g = int_to_bin(G), dh_y = PublicKey}, + enc_server_key_exchange(Version, ServerDHParams, HashSign, + ClientRandom, ServerRandom, PrivateKey); + +key_exchange(server, Version, {ecdh, #'ECPrivateKey'{publicKey = {0, ECPublicKey}, + parameters = ECCurve}, HashSign, + ClientRandom, ServerRandom, PrivateKey}) -> + ServerECParams = #server_ecdh_params{curve = ECCurve, public = ECPublicKey}, + enc_server_key_exchange(Version, ServerECParams, HashSign, + ClientRandom, ServerRandom, PrivateKey); + +key_exchange(server, Version, {psk, PskIdentityHint, + HashSign, ClientRandom, ServerRandom, PrivateKey}) -> + ServerPSKParams = #server_psk_params{hint = PskIdentityHint}, + enc_server_key_exchange(Version, ServerPSKParams, HashSign, + ClientRandom, ServerRandom, PrivateKey); + +key_exchange(server, Version, {dhe_psk, PskIdentityHint, {PublicKey, _}, + #'DHParameter'{prime = P, base = G}, + HashSign, ClientRandom, ServerRandom, PrivateKey}) -> + ServerEDHPSKParams = #server_dhe_psk_params{ + hint = PskIdentityHint, + dh_params = #server_dh_params{dh_p = int_to_bin(P), + dh_g = int_to_bin(G), dh_y = PublicKey} + }, + enc_server_key_exchange(Version, ServerEDHPSKParams, + HashSign, ClientRandom, ServerRandom, PrivateKey); + +key_exchange(server, Version, {srp, {PublicKey, _}, + #srp_user{generator = Generator, prime = Prime, + salt = Salt}, + HashSign, ClientRandom, ServerRandom, PrivateKey}) -> + ServerSRPParams = #server_srp_params{srp_n = Prime, srp_g = Generator, + srp_s = Salt, srp_b = PublicKey}, + enc_server_key_exchange(Version, ServerSRPParams, HashSign, + ClientRandom, ServerRandom, PrivateKey). + +%%-------------------------------------------------------------------- +-spec finished(tls_version(), client | server, integer(), binary(), tls_handshake_history()) -> + #finished{}. +%% +%% Description: Creates a handshake finished message +%%------------------------------------------------------------------- +finished(Version, Role, PrfAlgo, MasterSecret, {Handshake, _}) -> % use the current handshake + #finished{verify_data = + calc_finished(Version, Role, PrfAlgo, MasterSecret, Handshake)}. + +%% ---------- Handle handshake messages ---------- + +%%-------------------------------------------------------------------- +-spec certificate_verify(binary(), public_key_info(), tls_version(), term(), + binary(), tls_handshake_history()) -> valid | #alert{}. +%% +%% Description: Checks that the certificate_verify message is valid. +%%-------------------------------------------------------------------- +certificate_verify(Signature, PublicKeyInfo, Version, + HashSign = {HashAlgo, _}, MasterSecret, {_, Handshake}) -> + Hash = calc_certificate_verify(Version, HashAlgo, MasterSecret, Handshake), + case verify_signature(Version, Hash, HashSign, Signature, PublicKeyInfo) of + true -> + valid; + _ -> + ?ALERT_REC(?FATAL, ?BAD_CERTIFICATE) + end. +%%-------------------------------------------------------------------- +-spec verify_signature(tls_version(), binary(), {term(), term()}, binary(), + public_key_info()) -> true | false. +%% +%% Description: Checks that a public_key signature is valid. +%%-------------------------------------------------------------------- +verify_signature(_Version, _Hash, {_HashAlgo, anon}, _Signature, _) -> + true; +verify_signature({3, Minor}, Hash, {HashAlgo, rsa}, Signature, {?rsaEncryption, PubKey, _PubKeyParams}) + when Minor >= 3 -> + public_key:verify({digest, Hash}, HashAlgo, Signature, PubKey); +verify_signature(_Version, Hash, _HashAlgo, Signature, {?rsaEncryption, PubKey, _PubKeyParams}) -> + case public_key:decrypt_public(Signature, PubKey, + [{rsa_pad, rsa_pkcs1_padding}]) of + Hash -> true; + _ -> false + end; +verify_signature(_Version, Hash, {HashAlgo, dsa}, Signature, {?'id-dsa', PublicKey, PublicKeyParams}) -> + public_key:verify({digest, Hash}, HashAlgo, Signature, {PublicKey, PublicKeyParams}); +verify_signature(_Version, Hash, {HashAlgo, ecdsa}, Signature, + {?'id-ecPublicKey', PublicKey, PublicKeyParams}) -> + public_key:verify({digest, Hash}, HashAlgo, Signature, {PublicKey, PublicKeyParams}). + +%%-------------------------------------------------------------------- +-spec certify(#certificate{}, db_handle(), certdb_ref(), integer() | nolimit, + verify_peer | verify_none, {fun(), term}, + client | server) -> {der_cert(), public_key_info()} | #alert{}. +%% +%% Description: Handles a certificate handshake message +%%-------------------------------------------------------------------- +certify(#certificate{asn1_certificates = ASN1Certs}, CertDbHandle, CertDbRef, + MaxPathLen, _Verify, VerifyFunAndState, Role) -> + [PeerCert | _] = ASN1Certs, + + ValidationFunAndState = + case VerifyFunAndState of + undefined -> + {fun(OtpCert, ExtensionOrVerifyResult, SslState) -> + ssl_certificate:validate_extension(OtpCert, + ExtensionOrVerifyResult, SslState) + end, Role}; + {Fun, UserState0} -> + {fun(OtpCert, {extension, _} = Extension, {SslState, UserState}) -> + case ssl_certificate:validate_extension(OtpCert, + Extension, + SslState) of + {valid, NewSslState} -> + {valid, {NewSslState, UserState}}; + {fail, Reason} -> + apply_user_fun(Fun, OtpCert, Reason, UserState, + SslState); + {unknown, _} -> + apply_user_fun(Fun, OtpCert, + Extension, UserState, SslState) + end; + (OtpCert, VerifyResult, {SslState, UserState}) -> + apply_user_fun(Fun, OtpCert, VerifyResult, UserState, + SslState) + end, {Role, UserState0}} + end, + + try + {TrustedErlCert, CertPath} = + ssl_certificate:trusted_cert_and_path(ASN1Certs, CertDbHandle, CertDbRef), + case public_key:pkix_path_validation(TrustedErlCert, + CertPath, + [{max_path_length, + MaxPathLen}, + {verify_fun, ValidationFunAndState}]) of + {ok, {PublicKeyInfo,_}} -> + {PeerCert, PublicKeyInfo}; + {error, Reason} -> + path_validation_alert(Reason) + end + catch + error:_ -> + %% ASN-1 decode of certificate somehow failed + ?ALERT_REC(?FATAL, ?CERTIFICATE_UNKNOWN) + end. + +%%-------------------------------------------------------------------- +-spec verify_connection(tls_version(), #finished{}, client | server, integer(), binary(), + tls_handshake_history()) -> verified | #alert{}. +%% +%% Description: Checks the ssl handshake finished message to verify +%% the connection. +%%------------------------------------------------------------------- +verify_connection(Version, #finished{verify_data = Data}, + Role, PrfAlgo, MasterSecret, {_, Handshake}) -> + %% use the previous hashes + case calc_finished(Version, Role, PrfAlgo, MasterSecret, Handshake) of + Data -> + verified; + _ -> + ?ALERT_REC(?FATAL, ?DECRYPT_ERROR) + end. +%%-------------------------------------------------------------------- +-spec decrypt_premaster_secret(binary(), #'RSAPrivateKey'{}) -> binary(). + +%% +%% Description: Public key decryption using the private key. +%%-------------------------------------------------------------------- +decrypt_premaster_secret(Secret, RSAPrivateKey) -> + try public_key:decrypt_private(Secret, RSAPrivateKey, + [{rsa_pad, rsa_pkcs1_padding}]) + catch + _:_ -> + throw(?ALERT_REC(?FATAL, ?DECRYPT_ERROR)) + end. +%%-------------------------------------------------------------------- +-spec server_key_exchange_hash(md5sha | md5 | sha | sha224 |sha256 | sha384 | sha512, binary()) -> binary(). +%% +%% Description: Calculate server key exchange hash +%%-------------------------------------------------------------------- +server_key_exchange_hash(md5sha, Value) -> + MD5 = crypto:hash(md5, Value), + SHA = crypto:hash(sha, Value), + <<MD5/binary, SHA/binary>>; + +server_key_exchange_hash(Hash, Value) -> + crypto:hash(Hash, Value). +%%-------------------------------------------------------------------- +-spec prf(tls_version(), binary(), binary(), [binary()], non_neg_integer()) -> + {ok, binary()} | {error, undefined}. +%% +%% Description: use the TLS PRF to generate key material +%%-------------------------------------------------------------------- +prf({3,0}, _, _, _, _) -> + {error, undefined}; +prf({3,1}, Secret, Label, Seed, WantedLength) -> + {ok, tls_v1:prf(?MD5SHA, Secret, Label, Seed, WantedLength)}; +prf({3,_N}, Secret, Label, Seed, WantedLength) -> + {ok, tls_v1:prf(?SHA256, Secret, Label, Seed, WantedLength)}. + +%%-------------------------------------------------------------------- +-spec master_secret(atom(), tls_version(), #session{} | binary(), #connection_states{}, + client | server) -> {binary(), #connection_states{}} | #alert{}. +%% +%% Description: Sets or calculates the master secret and calculate keys, +%% updating the pending connection states. The Mastersecret and the update +%% connection states are returned or an alert if the calculation fails. +%%------------------------------------------------------------------- +master_secret(RecordCB, Version, #session{master_secret = Mastersecret}, + ConnectionStates, Role) -> + ConnectionState = + RecordCB:pending_connection_state(ConnectionStates, read), + SecParams = ConnectionState#connection_state.security_parameters, + try master_secret(RecordCB, Version, Mastersecret, SecParams, + ConnectionStates, Role) + catch + exit:Reason -> + Report = io_lib:format("Key calculation failed due to ~p", + [Reason]), + error_logger:error_report(Report), + ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE) + end; + +master_secret(RecordCB, Version, PremasterSecret, ConnectionStates, Role) -> + ConnectionState = + RecordCB:pending_connection_state(ConnectionStates, read), + SecParams = ConnectionState#connection_state.security_parameters, + #security_parameters{prf_algorithm = PrfAlgo, + client_random = ClientRandom, + server_random = ServerRandom} = SecParams, + try master_secret(RecordCB, Version, + calc_master_secret(Version,PrfAlgo,PremasterSecret, + ClientRandom, ServerRandom), + SecParams, ConnectionStates, Role) + catch + exit:Reason -> + Report = io_lib:format("Master secret calculation failed" + " due to ~p", [Reason]), + error_logger:error_report(Report), + ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE) + end. + +%%-------------Encode/Decode -------------------------------- +encode_handshake(#next_protocol{selected_protocol = SelectedProtocol}, _Version) -> + PaddingLength = 32 - ((byte_size(SelectedProtocol) + 2) rem 32), + {?NEXT_PROTOCOL, <<?BYTE((byte_size(SelectedProtocol))), SelectedProtocol/binary, + ?BYTE(PaddingLength), 0:(PaddingLength * 8)>>}; + +encode_handshake(#server_hello{server_version = {Major, Minor}, + random = Random, + session_id = Session_ID, + cipher_suite = CipherSuite, + compression_method = Comp_method, + extensions = #hello_extensions{} = Extensions}, _Version) -> + SID_length = byte_size(Session_ID), + ExtensionsBin = encode_hello_extensions(Extensions), + {?SERVER_HELLO, <<?BYTE(Major), ?BYTE(Minor), Random:32/binary, + ?BYTE(SID_length), Session_ID/binary, + CipherSuite/binary, ?BYTE(Comp_method), ExtensionsBin/binary>>}; +encode_handshake(#certificate{asn1_certificates = ASN1CertList}, _Version) -> + ASN1Certs = certs_from_list(ASN1CertList), + ACLen = erlang:iolist_size(ASN1Certs), + {?CERTIFICATE, <<?UINT24(ACLen), ASN1Certs:ACLen/binary>>}; +encode_handshake(#server_key_exchange{exchange_keys = Keys}, _Version) -> + {?SERVER_KEY_EXCHANGE, Keys}; +encode_handshake(#server_key_params{params_bin = Keys, hashsign = HashSign, + signature = Signature}, Version) -> + EncSign = enc_sign(HashSign, Signature, Version), + {?SERVER_KEY_EXCHANGE, <<Keys/binary, EncSign/binary>>}; +encode_handshake(#certificate_request{certificate_types = CertTypes, + hashsign_algorithms = #hash_sign_algos{hash_sign_algos = HashSignAlgos}, + certificate_authorities = CertAuths}, + {Major, Minor}) + when Major == 3, Minor >= 3 -> + HashSigns= << <<(ssl_cipher:hash_algorithm(Hash)):8, (ssl_cipher:sign_algorithm(Sign)):8>> || + {Hash, Sign} <- HashSignAlgos >>, + CertTypesLen = byte_size(CertTypes), + HashSignsLen = byte_size(HashSigns), + CertAuthsLen = byte_size(CertAuths), + {?CERTIFICATE_REQUEST, + <<?BYTE(CertTypesLen), CertTypes/binary, + ?UINT16(HashSignsLen), HashSigns/binary, + ?UINT16(CertAuthsLen), CertAuths/binary>> + }; +encode_handshake(#certificate_request{certificate_types = CertTypes, + certificate_authorities = CertAuths}, + _Version) -> + CertTypesLen = byte_size(CertTypes), + CertAuthsLen = byte_size(CertAuths), + {?CERTIFICATE_REQUEST, + <<?BYTE(CertTypesLen), CertTypes/binary, + ?UINT16(CertAuthsLen), CertAuths/binary>> + }; +encode_handshake(#server_hello_done{}, _Version) -> + {?SERVER_HELLO_DONE, <<>>}; +encode_handshake(#client_key_exchange{exchange_keys = ExchangeKeys}, Version) -> + {?CLIENT_KEY_EXCHANGE, encode_client_key(ExchangeKeys, Version)}; +encode_handshake(#certificate_verify{signature = BinSig, hashsign_algorithm = HashSign}, Version) -> + EncSig = enc_sign(HashSign, BinSig, Version), + {?CERTIFICATE_VERIFY, EncSig}; +encode_handshake(#finished{verify_data = VerifyData}, _Version) -> + {?FINISHED, VerifyData}. + +encode_hello_extensions(#hello_extensions{} = Extensions) -> + encode_hello_extensions(hello_extensions_list(Extensions), <<>>). +encode_hello_extensions([], <<>>) -> + <<>>; +encode_hello_extensions([], Acc) -> + Size = byte_size(Acc), + <<?UINT16(Size), Acc/binary>>; + +encode_hello_extensions([#next_protocol_negotiation{extension_data = ExtensionData} | Rest], Acc) -> + Len = byte_size(ExtensionData), + encode_hello_extensions(Rest, <<?UINT16(?NEXTPROTONEG_EXT), ?UINT16(Len), + ExtensionData/binary, Acc/binary>>); +encode_hello_extensions([#renegotiation_info{renegotiated_connection = undefined} | Rest], Acc) -> + encode_hello_extensions(Rest, Acc); +encode_hello_extensions([#renegotiation_info{renegotiated_connection = ?byte(0) = Info} | Rest], Acc) -> + Len = byte_size(Info), + encode_hello_extensions(Rest, <<?UINT16(?RENEGOTIATION_EXT), ?UINT16(Len), Info/binary, Acc/binary>>); + +encode_hello_extensions([#renegotiation_info{renegotiated_connection = Info} | Rest], Acc) -> + InfoLen = byte_size(Info), + Len = InfoLen +1, + encode_hello_extensions(Rest, <<?UINT16(?RENEGOTIATION_EXT), ?UINT16(Len), ?BYTE(InfoLen), + Info/binary, Acc/binary>>); +encode_hello_extensions([#elliptic_curves{elliptic_curve_list = EllipticCurves} | Rest], Acc) -> + EllipticCurveList = << <<(tls_v1:oid_to_enum(X)):16>> || X <- EllipticCurves>>, + ListLen = byte_size(EllipticCurveList), + Len = ListLen + 2, + encode_hello_extensions(Rest, <<?UINT16(?ELLIPTIC_CURVES_EXT), + ?UINT16(Len), ?UINT16(ListLen), EllipticCurveList/binary, Acc/binary>>); +encode_hello_extensions([#ec_point_formats{ec_point_format_list = ECPointFormats} | Rest], Acc) -> + ECPointFormatList = list_to_binary(ECPointFormats), + ListLen = byte_size(ECPointFormatList), + Len = ListLen + 1, + encode_hello_extensions(Rest, <<?UINT16(?EC_POINT_FORMATS_EXT), + ?UINT16(Len), ?BYTE(ListLen), ECPointFormatList/binary, Acc/binary>>); +encode_hello_extensions([#srp{username = UserName} | Rest], Acc) -> + SRPLen = byte_size(UserName), + Len = SRPLen + 2, + encode_hello_extensions(Rest, <<?UINT16(?SRP_EXT), ?UINT16(Len), ?BYTE(SRPLen), + UserName/binary, Acc/binary>>); +encode_hello_extensions([#hash_sign_algos{hash_sign_algos = HashSignAlgos} | Rest], Acc) -> + SignAlgoList = << <<(ssl_cipher:hash_algorithm(Hash)):8, (ssl_cipher:sign_algorithm(Sign)):8>> || + {Hash, Sign} <- HashSignAlgos >>, + ListLen = byte_size(SignAlgoList), + Len = ListLen + 2, + encode_hello_extensions(Rest, <<?UINT16(?SIGNATURE_ALGORITHMS_EXT), + ?UINT16(Len), ?UINT16(ListLen), SignAlgoList/binary, Acc/binary>>). + +enc_server_key_exchange(Version, Params, {HashAlgo, SignAlgo}, + ClientRandom, ServerRandom, PrivateKey) -> + EncParams = encode_server_key(Params), + case HashAlgo of + null -> + #server_key_params{params = Params, + params_bin = EncParams, + hashsign = {null, anon}, + signature = <<>>}; + _ -> + Hash = + server_key_exchange_hash(HashAlgo, <<ClientRandom/binary, + ServerRandom/binary, + EncParams/binary>>), + Signature = digitally_signed(Version, Hash, HashAlgo, PrivateKey), + #server_key_params{params = Params, + params_bin = EncParams, + hashsign = {HashAlgo, SignAlgo}, + signature = Signature} + end. + +%%-------------------------------------------------------------------- +-spec decode_client_key(binary(), key_algo(), tls_version()) -> + #encrypted_premaster_secret{} + | #client_diffie_hellman_public{} + | #client_ec_diffie_hellman_public{} + | #client_psk_identity{} + | #client_dhe_psk_identity{} + | #client_rsa_psk_identity{} + | #client_srp_public{}. +%% +%% Description: Decode client_key data and return appropriate type +%%-------------------------------------------------------------------- +decode_client_key(ClientKey, Type, Version) -> + dec_client_key(ClientKey, key_exchange_alg(Type), Version). + +%%-------------------------------------------------------------------- +-spec decode_server_key(binary(), key_algo(), tls_version()) -> + #server_key_params{}. +%% +%% Description: Decode server_key data and return appropriate type +%%-------------------------------------------------------------------- +decode_server_key(ServerKey, Type, Version) -> + dec_server_key(ServerKey, key_exchange_alg(Type), Version). + +encode_client_protocol_negotiation(undefined, _) -> + undefined; +encode_client_protocol_negotiation(_, false) -> + #next_protocol_negotiation{extension_data = <<>>}; +encode_client_protocol_negotiation(_, _) -> + undefined. + +encode_protocols_advertised_on_server(undefined) -> + undefined; + +encode_protocols_advertised_on_server(Protocols) -> + #next_protocol_negotiation{extension_data = lists:foldl(fun encode_protocol/2, <<>>, Protocols)}. + +decode_handshake(_, ?HELLO_REQUEST, <<>>) -> + #hello_request{}; +decode_handshake(_, ?NEXT_PROTOCOL, <<?BYTE(SelectedProtocolLength), + SelectedProtocol:SelectedProtocolLength/binary, + ?BYTE(PaddingLength), _Padding:PaddingLength/binary>>) -> + #next_protocol{selected_protocol = SelectedProtocol}; + +decode_handshake(_Version, ?SERVER_HELLO, <<?BYTE(Major), ?BYTE(Minor), Random:32/binary, + ?BYTE(SID_length), Session_ID:SID_length/binary, + Cipher_suite:2/binary, ?BYTE(Comp_method)>>) -> + #server_hello{ + server_version = {Major,Minor}, + random = Random, + session_id = Session_ID, + cipher_suite = Cipher_suite, + compression_method = Comp_method, + extensions = #hello_extensions{}}; + +decode_handshake(_Version, ?SERVER_HELLO, <<?BYTE(Major), ?BYTE(Minor), Random:32/binary, + ?BYTE(SID_length), Session_ID:SID_length/binary, + Cipher_suite:2/binary, ?BYTE(Comp_method), + ?UINT16(ExtLen), Extensions:ExtLen/binary>>) -> + + HelloExtensions = decode_hello_extensions(Extensions), + + #server_hello{ + server_version = {Major,Minor}, + random = Random, + session_id = Session_ID, + cipher_suite = Cipher_suite, + compression_method = Comp_method, + extensions = HelloExtensions}; + +decode_handshake(_Version, ?CERTIFICATE, <<?UINT24(ACLen), ASN1Certs:ACLen/binary>>) -> + #certificate{asn1_certificates = certs_to_list(ASN1Certs)}; +decode_handshake(_Version, ?SERVER_KEY_EXCHANGE, Keys) -> + #server_key_exchange{exchange_keys = Keys}; +decode_handshake({Major, Minor}, ?CERTIFICATE_REQUEST, + <<?BYTE(CertTypesLen), CertTypes:CertTypesLen/binary, + ?UINT16(HashSignsLen), HashSigns:HashSignsLen/binary, + ?UINT16(CertAuthsLen), CertAuths:CertAuthsLen/binary>>) + when Major == 3, Minor >= 3 -> + HashSignAlgos = [{ssl_cipher:hash_algorithm(Hash), ssl_cipher:sign_algorithm(Sign)} || + <<?BYTE(Hash), ?BYTE(Sign)>> <= HashSigns], + #certificate_request{certificate_types = CertTypes, + hashsign_algorithms = #hash_sign_algos{hash_sign_algos = HashSignAlgos}, + certificate_authorities = CertAuths}; +decode_handshake(_Version, ?CERTIFICATE_REQUEST, + <<?BYTE(CertTypesLen), CertTypes:CertTypesLen/binary, + ?UINT16(CertAuthsLen), CertAuths:CertAuthsLen/binary>>) -> + #certificate_request{certificate_types = CertTypes, + certificate_authorities = CertAuths}; +decode_handshake(_Version, ?SERVER_HELLO_DONE, <<>>) -> + #server_hello_done{}; +decode_handshake({Major, Minor}, ?CERTIFICATE_VERIFY,<<HashSign:2/binary, ?UINT16(SignLen), + Signature:SignLen/binary>>) + when Major == 3, Minor >= 3 -> + #certificate_verify{hashsign_algorithm = dec_hashsign(HashSign), signature = Signature}; +decode_handshake(_Version, ?CERTIFICATE_VERIFY,<<?UINT16(SignLen), Signature:SignLen/binary>>)-> + #certificate_verify{signature = Signature}; +decode_handshake(_Version, ?CLIENT_KEY_EXCHANGE, PKEPMS) -> + #client_key_exchange{exchange_keys = PKEPMS}; +decode_handshake(_Version, ?FINISHED, VerifyData) -> + #finished{verify_data = VerifyData}; +decode_handshake(_, _, _) -> + throw(?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE)). + +%%-------------------------------------------------------------------- +-spec decode_hello_extensions(binary()) -> #hello_extensions{}. +%% +%% Description: Decodes TLS hello extensions +%%-------------------------------------------------------------------- +decode_hello_extensions({client, <<>>}) -> + #hello_extensions{}; +decode_hello_extensions({client, <<?UINT16(ExtLen), Extensions:ExtLen/binary>>}) -> + decode_hello_extensions(Extensions); +decode_hello_extensions(Extensions) -> + dec_hello_extensions(Extensions, #hello_extensions{}). + +dec_server_key(<<?UINT16(PLen), P:PLen/binary, + ?UINT16(GLen), G:GLen/binary, + ?UINT16(YLen), Y:YLen/binary, _/binary>> = KeyStruct, + ?KEY_EXCHANGE_DIFFIE_HELLMAN, Version) -> + Params = #server_dh_params{dh_p = P, dh_g = G, dh_y = Y}, + {BinMsg, HashSign, Signature} = dec_server_key_params(PLen + GLen + YLen + 6, KeyStruct, Version), + #server_key_params{params = Params, + params_bin = BinMsg, + hashsign = HashSign, + signature = Signature}; +%% ECParameters with named_curve +%% TODO: explicit curve +dec_server_key(<<?BYTE(?NAMED_CURVE), ?UINT16(CurveID), + ?BYTE(PointLen), ECPoint:PointLen/binary, + _/binary>> = KeyStruct, + ?KEY_EXCHANGE_EC_DIFFIE_HELLMAN, Version) -> + Params = #server_ecdh_params{curve = {namedCurve, ssl_tls1:enum_to_oid(CurveID)}, + public = ECPoint}, + {BinMsg, HashSign, Signature} = dec_server_key_params(PointLen + 4, KeyStruct, Version), + #server_key_params{params = Params, + params_bin = BinMsg, + hashsign = HashSign, + signature = Signature}; +dec_server_key(<<?UINT16(Len), PskIdentityHint:Len/binary>> = KeyStruct, + KeyExchange, Version) + when KeyExchange == ?KEY_EXCHANGE_PSK; KeyExchange == ?KEY_EXCHANGE_RSA_PSK -> + Params = #server_psk_params{ + hint = PskIdentityHint}, + {BinMsg, HashSign, Signature} = dec_server_key_params(Len + 2, KeyStruct, Version), + #server_key_params{params = Params, + params_bin = BinMsg, + hashsign = HashSign, + signature = Signature}; +dec_server_key(<<?UINT16(Len), IdentityHint:Len/binary, + ?UINT16(PLen), P:PLen/binary, + ?UINT16(GLen), G:GLen/binary, + ?UINT16(YLen), Y:YLen/binary, _/binary>> = KeyStruct, + ?KEY_EXCHANGE_DHE_PSK, Version) -> + DHParams = #server_dh_params{dh_p = P, dh_g = G, dh_y = Y}, + Params = #server_dhe_psk_params{ + hint = IdentityHint, + dh_params = DHParams}, + {BinMsg, HashSign, Signature} = dec_server_key_params(Len + PLen + GLen + YLen + 8, KeyStruct, Version), + #server_key_params{params = Params, + params_bin = BinMsg, + hashsign = HashSign, + signature = Signature}; +dec_server_key(<<?UINT16(NLen), N:NLen/binary, + ?UINT16(GLen), G:GLen/binary, + ?BYTE(SLen), S:SLen/binary, + ?UINT16(BLen), B:BLen/binary, _/binary>> = KeyStruct, + ?KEY_EXCHANGE_SRP, Version) -> + Params = #server_srp_params{srp_n = N, srp_g = G, srp_s = S, srp_b = B}, + {BinMsg, HashSign, Signature} = dec_server_key_params(NLen + GLen + SLen + BLen + 7, KeyStruct, Version), + #server_key_params{params = Params, + params_bin = BinMsg, + hashsign = HashSign, + signature = Signature}; +dec_server_key(_, _, _) -> + throw(?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE)). + +%%-------------------------------------------------------------------- +-spec decode_suites('2_bytes'|'3_bytes', binary()) -> list(). +%% +%% Description: +%%-------------------------------------------------------------------- +decode_suites('2_bytes', Dec) -> + from_2bytes(Dec); +decode_suites('3_bytes', Dec) -> + from_3bytes(Dec). + +%%-------------Cipeher suite handling -------------------------------- + +available_suites(UserSuites, Version) -> + case UserSuites of + [] -> + ssl_cipher:suites(Version); + _ -> + UserSuites + end. + +available_suites(ServerCert, UserSuites, Version) -> + ssl_cipher:filter(ServerCert, available_suites(UserSuites, Version)). + +cipher_suites(Suites, false) -> + [?TLS_EMPTY_RENEGOTIATION_INFO_SCSV | Suites]; +cipher_suites(Suites, true) -> + Suites. + +select_session(SuggestedSessionId, CipherSuites, Compressions, Port, Session, Version, + #ssl_options{ciphers = UserSuites} = SslOpts, Cache, CacheCb, Cert) -> + {SessionId, Resumed} = ssl_session:server_id(Port, SuggestedSessionId, + SslOpts, Cert, + Cache, CacheCb), + Suites = ssl_handshake:available_suites(Cert, UserSuites, Version), + case Resumed of + undefined -> + CipherSuite = select_cipher_suite(CipherSuites, Suites), + Compression = select_compression(Compressions), + {new, Session#session{session_id = SessionId, + cipher_suite = CipherSuite, + compression_method = Compression}}; + _ -> + {resumed, Resumed} + end. + +%%-------------certificate handling -------------------------------- + +certificate_types({KeyExchange, _, _, _}) + when KeyExchange == rsa; + KeyExchange == dhe_dss; + KeyExchange == dhe_rsa; + KeyExchange == ecdhe_rsa -> + <<?BYTE(?RSA_SIGN), ?BYTE(?DSS_SIGN)>>; + +certificate_types({KeyExchange, _, _, _}) + when KeyExchange == dh_ecdsa; + KeyExchange == dhe_ecdsa -> + <<?BYTE(?ECDSA_SIGN)>>; + +certificate_types(_) -> + <<?BYTE(?RSA_SIGN)>>. + +certificate_authorities(CertDbHandle, CertDbRef) -> + Authorities = certificate_authorities_from_db(CertDbHandle, CertDbRef), + Enc = fun(#'OTPCertificate'{tbsCertificate=TBSCert}) -> + OTPSubj = TBSCert#'OTPTBSCertificate'.subject, + DNEncodedBin = public_key:pkix_encode('Name', OTPSubj, otp), + DNEncodedLen = byte_size(DNEncodedBin), + <<?UINT16(DNEncodedLen), DNEncodedBin/binary>> + end, + list_to_binary([Enc(Cert) || {_, Cert} <- Authorities]). + +certificate_authorities_from_db(CertDbHandle, CertDbRef) -> + ConnectionCerts = fun({{Ref, _, _}, Cert}, Acc) when Ref == CertDbRef -> + [Cert | Acc]; + (_, Acc) -> + Acc + end, + ssl_pkix_db:foldl(ConnectionCerts, [], CertDbHandle). + +%%-------------Extension handling -------------------------------- + +handle_client_hello_extensions(RecordCB, Random, + #hello_extensions{renegotiation_info = Info, + srp = SRP, + next_protocol_negotiation = NextProtocolNegotiation, + ec_point_formats = EcPointFormats0, + elliptic_curves = EllipticCurves0}, Version, + #ssl_options{secure_renegotiate = SecureRenegotation} = Opts, + #session{cipher_suite = CipherSuite, compression_method = Compression} = Session0, + ConnectionStates0, Renegotiation) -> + Session = handle_srp_extension(SRP, Session0), + ConnectionStates = handle_renegotiation_extension(server, RecordCB, Version, Info, + Random, CipherSuite, Compression, + ConnectionStates0, Renegotiation, SecureRenegotation), + ProtocolsToAdvertise = handle_next_protocol_extension(NextProtocolNegotiation, Renegotiation, Opts), + {EcPointFormats, EllipticCurves} = handle_ecc_extensions(Version, EcPointFormats0, EllipticCurves0), + ServerHelloExtensions = #hello_extensions{ + renegotiation_info = renegotiation_info(RecordCB, server, + ConnectionStates, Renegotiation), + ec_point_formats = EcPointFormats, + elliptic_curves = EllipticCurves, + next_protocol_negotiation = + encode_protocols_advertised_on_server(ProtocolsToAdvertise) + }, + {Session, ConnectionStates, ServerHelloExtensions}. + +handle_server_hello_extensions(RecordCB, Random, CipherSuite, Compression, + #hello_extensions{renegotiation_info = Info, + next_protocol_negotiation = NextProtocolNegotiation}, Version, + #ssl_options{secure_renegotiate = SecureRenegotation, + next_protocol_selector = NextProtoSelector}, + ConnectionStates0, Renegotiation) -> + ConnectionStates = handle_renegotiation_extension(client, RecordCB, Version, Info, Random, CipherSuite, + Compression, ConnectionStates0, + Renegotiation, SecureRenegotation), + case handle_next_protocol(NextProtocolNegotiation, NextProtoSelector, Renegotiation) of + #alert{} = Alert -> + Alert; + Protocol -> + {ConnectionStates, Protocol} + end. + +select_version(RecordCB, ClientVersion, Versions) -> + ServerVersion = RecordCB:highest_protocol_version(Versions), + RecordCB:lowest_protocol_version(ClientVersion, ServerVersion). + +renegotiation_info(_, client, _, false) -> + #renegotiation_info{renegotiated_connection = undefined}; +renegotiation_info(RecordCB, server, ConnectionStates, false) -> + CS = RecordCB:current_connection_state(ConnectionStates, read), + case CS#connection_state.secure_renegotiation of + true -> + #renegotiation_info{renegotiated_connection = ?byte(0)}; + false -> + #renegotiation_info{renegotiated_connection = undefined} + end; +renegotiation_info(RecordCB, client, ConnectionStates, true) -> + CS = RecordCB:current_connection_state(ConnectionStates, read), + case CS#connection_state.secure_renegotiation of + true -> + Data = CS#connection_state.client_verify_data, + #renegotiation_info{renegotiated_connection = Data}; + false -> + #renegotiation_info{renegotiated_connection = undefined} + end; + +renegotiation_info(RecordCB, server, ConnectionStates, true) -> + CS = RecordCB:current_connection_state(ConnectionStates, read), + case CS#connection_state.secure_renegotiation of + true -> + CData = CS#connection_state.client_verify_data, + SData =CS#connection_state.server_verify_data, + #renegotiation_info{renegotiated_connection = <<CData/binary, SData/binary>>}; + false -> + #renegotiation_info{renegotiated_connection = undefined} + end. + +handle_renegotiation_info(RecordCB, _, #renegotiation_info{renegotiated_connection = ?byte(0)}, + ConnectionStates, false, _, _) -> + {ok, RecordCB:set_renegotiation_flag(true, ConnectionStates)}; + +handle_renegotiation_info(RecordCB, server, undefined, ConnectionStates, _, _, CipherSuites) -> + case is_member(?TLS_EMPTY_RENEGOTIATION_INFO_SCSV, CipherSuites) of + true -> + {ok, RecordCB:set_renegotiation_flag(true, ConnectionStates)}; + false -> + {ok, RecordCB:set_renegotiation_flag(false, ConnectionStates)} + end; + +handle_renegotiation_info(RecordCB, _, undefined, ConnectionStates, false, _, _) -> + {ok, RecordCB:set_renegotiation_flag(false, ConnectionStates)}; + +handle_renegotiation_info(RecordCB, client, #renegotiation_info{renegotiated_connection = ClientServerVerify}, + ConnectionStates, true, _, _) -> + CS = RecordCB:current_connection_state(ConnectionStates, read), + CData = CS#connection_state.client_verify_data, + SData = CS#connection_state.server_verify_data, + case <<CData/binary, SData/binary>> == ClientServerVerify of + true -> + {ok, ConnectionStates}; + false -> + ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE) + end; +handle_renegotiation_info(RecordCB, server, #renegotiation_info{renegotiated_connection = ClientVerify}, + ConnectionStates, true, _, CipherSuites) -> + + case is_member(?TLS_EMPTY_RENEGOTIATION_INFO_SCSV, CipherSuites) of + true -> + ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE); + false -> + CS = RecordCB:current_connection_state(ConnectionStates, read), + Data = CS#connection_state.client_verify_data, + case Data == ClientVerify of + true -> + {ok, ConnectionStates}; + false -> + ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE) + end + end; + +handle_renegotiation_info(RecordCB, client, undefined, ConnectionStates, true, SecureRenegotation, _) -> + handle_renegotiation_info(RecordCB, ConnectionStates, SecureRenegotation); + +handle_renegotiation_info(RecordCB, server, undefined, ConnectionStates, true, SecureRenegotation, CipherSuites) -> + case is_member(?TLS_EMPTY_RENEGOTIATION_INFO_SCSV, CipherSuites) of + true -> + ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE); + false -> + handle_renegotiation_info(RecordCB, ConnectionStates, SecureRenegotation) + end. + +handle_renegotiation_info(RecordCB, ConnectionStates, SecureRenegotation) -> + CS = RecordCB:current_connection_state(ConnectionStates, read), + case {SecureRenegotation, CS#connection_state.secure_renegotiation} of + {_, true} -> + ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE); + {true, false} -> + ?ALERT_REC(?FATAL, ?NO_RENEGOTIATION); + {false, false} -> + {ok, ConnectionStates} + end. + +hello_extensions_list(#hello_extensions{renegotiation_info = RenegotiationInfo, + srp = SRP, + hash_signs = HashSigns, + ec_point_formats = EcPointFormats, + elliptic_curves = EllipticCurves, + next_protocol_negotiation = NextProtocolNegotiation}) -> + [Ext || Ext <- [RenegotiationInfo, SRP, HashSigns, + EcPointFormats,EllipticCurves, NextProtocolNegotiation], Ext =/= undefined]. + +srp_user(#ssl_options{srp_identity = {UserName, _}}) -> + #srp{username = UserName}; +srp_user(_) -> + undefined. + +ecc_extensions(Module, Version) -> + CryptoSupport = proplists:get_value(public_keys, crypto:supports()), + case proplists:get_bool(ecdh, CryptoSupport) of + true -> + EcPointFormats = #ec_point_formats{ec_point_format_list = [?ECPOINT_UNCOMPRESSED]}, + EllipticCurves = #elliptic_curves{elliptic_curve_list = Module:ecc_curves(Version)}, + {EcPointFormats, EllipticCurves}; + _ -> + {undefined, undefined} + end. + +handle_ecc_extensions(Version, EcPointFormats0, EllipticCurves0) -> + CryptoSupport = proplists:get_value(public_keys, crypto:supports()), + case proplists:get_bool(ecdh, CryptoSupport) of + true -> + EcPointFormats1 = handle_ecc_point_fmt_extension(EcPointFormats0), + EllipticCurves1 = handle_ecc_curves_extension(Version, EllipticCurves0), + {EcPointFormats1, EllipticCurves1}; + _ -> + {undefined, undefined} + end. + +handle_ecc_point_fmt_extension(undefined) -> + undefined; +handle_ecc_point_fmt_extension(_) -> + #ec_point_formats{ec_point_format_list = [?ECPOINT_UNCOMPRESSED]}. + +handle_ecc_curves_extension(_Version, undefined) -> + undefined; +handle_ecc_curves_extension(Version, _) -> + #elliptic_curves{elliptic_curve_list = tls_v1:ecc_curves(Version)}. + +-define(TLSEXT_SIGALG_RSA(MD), {MD, rsa}). +-define(TLSEXT_SIGALG_DSA(MD), {MD, dsa}). +-define(TLSEXT_SIGALG_ECDSA(MD), {MD, ecdsa}). + +-define(TLSEXT_SIGALG(MD), ?TLSEXT_SIGALG_ECDSA(MD), ?TLSEXT_SIGALG_RSA(MD)). + +default_hash_signs() -> + HashSigns = [?TLSEXT_SIGALG(sha512), + ?TLSEXT_SIGALG(sha384), + ?TLSEXT_SIGALG(sha256), + ?TLSEXT_SIGALG(sha224), + ?TLSEXT_SIGALG(sha), + ?TLSEXT_SIGALG_DSA(sha), + ?TLSEXT_SIGALG_RSA(md5)], + CryptoSupport = proplists:get_value(public_keys, crypto:supports()), + HasECC = proplists:get_bool(ecdsa, CryptoSupport), + #hash_sign_algos{hash_sign_algos = + lists:filter(fun({_, ecdsa}) -> HasECC; + (_) -> true end, HashSigns)}. + +advertises_ec_ciphers([]) -> + false; +advertises_ec_ciphers([{ecdh_ecdsa, _,_,_} | _]) -> + true; +advertises_ec_ciphers([{ecdhe_ecdsa, _,_,_} | _]) -> + true; +advertises_ec_ciphers([{ecdh_rsa, _,_,_} | _]) -> + true; +advertises_ec_ciphers([{ecdhe_rsa, _,_,_} | _]) -> + true; +advertises_ec_ciphers([{ecdh_anon, _,_,_} | _]) -> + true; +advertises_ec_ciphers([_| Rest]) -> + advertises_ec_ciphers(Rest). + +%%-------------------------------------------------------------------- +%%% Internal functions +%%-------------------------------------------------------------------- +apply_user_fun(Fun, OtpCert, ExtensionOrError, UserState0, SslState) -> + case Fun(OtpCert, ExtensionOrError, UserState0) of + {valid, UserState} -> + {valid, {SslState, UserState}}; + {fail, _} = Fail -> + Fail; + {unknown, UserState} -> + {unknown, {SslState, UserState}} + end. +path_validation_alert({bad_cert, cert_expired}) -> + ?ALERT_REC(?FATAL, ?CERTIFICATE_EXPIRED); +path_validation_alert({bad_cert, invalid_issuer}) -> + ?ALERT_REC(?FATAL, ?BAD_CERTIFICATE); +path_validation_alert({bad_cert, invalid_signature}) -> + ?ALERT_REC(?FATAL, ?BAD_CERTIFICATE); +path_validation_alert({bad_cert, name_not_permitted}) -> + ?ALERT_REC(?FATAL, ?BAD_CERTIFICATE); +path_validation_alert({bad_cert, unknown_critical_extension}) -> + ?ALERT_REC(?FATAL, ?UNSUPPORTED_CERTIFICATE); +path_validation_alert({bad_cert, cert_revoked}) -> + ?ALERT_REC(?FATAL, ?CERTIFICATE_REVOKED); +path_validation_alert({bad_cert, selfsigned_peer}) -> + ?ALERT_REC(?FATAL, ?BAD_CERTIFICATE); +path_validation_alert({bad_cert, unknown_ca}) -> + ?ALERT_REC(?FATAL, ?UNKNOWN_CA); +path_validation_alert(_) -> + ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE). + +encrypted_premaster_secret(Secret, RSAPublicKey) -> + try + PreMasterSecret = public_key:encrypt_public(Secret, RSAPublicKey, + [{rsa_pad, + rsa_pkcs1_padding}]), + #encrypted_premaster_secret{premaster_secret = PreMasterSecret} + catch + _:_-> + throw(?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE)) + end. + +digitally_signed({3, Minor}, Hash, HashAlgo, Key) when Minor >= 3 -> + public_key:sign({digest, Hash}, HashAlgo, Key); +digitally_signed(_Version, Hash, HashAlgo, #'DSAPrivateKey'{} = Key) -> + public_key:sign({digest, Hash}, HashAlgo, Key); +digitally_signed(_Version, Hash, _HashAlgo, #'RSAPrivateKey'{} = Key) -> + public_key:encrypt_private(Hash, Key, + [{rsa_pad, rsa_pkcs1_padding}]); +digitally_signed(_Version, Hash, HashAlgo, Key) -> + public_key:sign({digest, Hash}, HashAlgo, Key). + +calc_certificate_verify({3, 0}, HashAlgo, MasterSecret, Handshake) -> + ssl_v3:certificate_verify(HashAlgo, MasterSecret, lists:reverse(Handshake)); +calc_certificate_verify({3, N}, HashAlgo, _MasterSecret, Handshake) -> + tls_v1:certificate_verify(HashAlgo, N, lists:reverse(Handshake)). + +calc_finished({3, 0}, Role, _PrfAlgo, MasterSecret, Handshake) -> + ssl_v3:finished(Role, MasterSecret, lists:reverse(Handshake)); +calc_finished({3, N}, Role, PrfAlgo, MasterSecret, Handshake) -> + tls_v1:finished(Role, N, PrfAlgo, MasterSecret, lists:reverse(Handshake)). + +master_secret(RecordCB, Version, MasterSecret, + #security_parameters{ + client_random = ClientRandom, + server_random = ServerRandom, + hash_size = HashSize, + prf_algorithm = PrfAlgo, + key_material_length = KML, + expanded_key_material_length = EKML, + iv_size = IVS}, + ConnectionStates, Role) -> + {ClientWriteMacSecret, ServerWriteMacSecret, ClientWriteKey, + ServerWriteKey, ClientIV, ServerIV} = + setup_keys(Version, PrfAlgo, MasterSecret, ServerRandom, + ClientRandom, HashSize, KML, EKML, IVS), + + ConnStates1 = RecordCB:set_master_secret(MasterSecret, ConnectionStates), + ConnStates2 = + RecordCB:set_mac_secret(ClientWriteMacSecret, ServerWriteMacSecret, + Role, ConnStates1), + + ClientCipherState = #cipher_state{iv = ClientIV, key = ClientWriteKey}, + ServerCipherState = #cipher_state{iv = ServerIV, key = ServerWriteKey}, + {MasterSecret, + RecordCB:set_pending_cipher_state(ConnStates2, ClientCipherState, + ServerCipherState, Role)}. + +setup_keys({3,0}, _PrfAlgo, MasterSecret, + ServerRandom, ClientRandom, HashSize, KML, EKML, IVS) -> + ssl_v3:setup_keys(MasterSecret, ServerRandom, + ClientRandom, HashSize, KML, EKML, IVS); + +setup_keys({3,N}, PrfAlgo, MasterSecret, + ServerRandom, ClientRandom, HashSize, KML, _EKML, IVS) -> + tls_v1:setup_keys(N, PrfAlgo, MasterSecret, ServerRandom, ClientRandom, HashSize, + KML, IVS). + +calc_master_secret({3,0}, _PrfAlgo, PremasterSecret, ClientRandom, ServerRandom) -> + ssl_v3:master_secret(PremasterSecret, ClientRandom, ServerRandom); + +calc_master_secret({3,_}, PrfAlgo, PremasterSecret, ClientRandom, ServerRandom) -> + tls_v1:master_secret(PrfAlgo, PremasterSecret, ClientRandom, ServerRandom). + +handle_renegotiation_extension(Role, RecordCB, Version, Info, Random, CipherSuite, Compression, + ConnectionStates0, Renegotiation, SecureRenegotation) -> + case handle_renegotiation_info(RecordCB, Role, Info, ConnectionStates0, + Renegotiation, SecureRenegotation, + [CipherSuite]) of + {ok, ConnectionStates} -> + hello_pending_connection_states(RecordCB, Role, + Version, + CipherSuite, + Random, + Compression, + ConnectionStates); + #alert{} = Alert -> + throw(Alert) + end. + +%% Update pending connection states with parameters exchanged via +%% hello messages +%% NOTE : Role is the role of the receiver of the hello message +%% currently being processed. +hello_pending_connection_states(RecordCB, Role, Version, CipherSuite, Random, Compression, + ConnectionStates) -> + ReadState = + RecordCB:pending_connection_state(ConnectionStates, read), + WriteState = + RecordCB:pending_connection_state(ConnectionStates, write), + + NewReadSecParams = + hello_security_parameters(Role, Version, ReadState, CipherSuite, + Random, Compression), + + NewWriteSecParams = + hello_security_parameters(Role, Version, WriteState, CipherSuite, + Random, Compression), + + RecordCB:update_security_params(NewReadSecParams, + NewWriteSecParams, + ConnectionStates). + +hello_security_parameters(client, Version, ConnectionState, CipherSuite, Random, + Compression) -> + SecParams = ConnectionState#connection_state.security_parameters, + NewSecParams = ssl_cipher:security_parameters(Version, CipherSuite, SecParams), + NewSecParams#security_parameters{ + server_random = Random, + compression_algorithm = Compression + }; + +hello_security_parameters(server, Version, ConnectionState, CipherSuite, Random, + Compression) -> + SecParams = ConnectionState#connection_state.security_parameters, + NewSecParams = ssl_cipher:security_parameters(Version, CipherSuite, SecParams), + NewSecParams#security_parameters{ + client_random = Random, + compression_algorithm = Compression + }. + +%%-------------Encode/Decode -------------------------------- + +encode_server_key(#server_dh_params{dh_p = P, dh_g = G, dh_y = Y}) -> + PLen = byte_size(P), + GLen = byte_size(G), + YLen = byte_size(Y), + <<?UINT16(PLen), P/binary, ?UINT16(GLen), G/binary, ?UINT16(YLen), Y/binary>>; +encode_server_key(#server_ecdh_params{curve = {namedCurve, ECCurve}, public = ECPubKey}) -> + %%TODO: support arbitrary keys + KLen = size(ECPubKey), + <<?BYTE(?NAMED_CURVE), ?UINT16((tls_v1:oid_to_enum(ECCurve))), + ?BYTE(KLen), ECPubKey/binary>>; +encode_server_key(#server_psk_params{hint = PskIdentityHint}) -> + Len = byte_size(PskIdentityHint), + <<?UINT16(Len), PskIdentityHint/binary>>; +encode_server_key(Params = #server_dhe_psk_params{hint = undefined}) -> + encode_server_key(Params#server_dhe_psk_params{hint = <<>>}); +encode_server_key(#server_dhe_psk_params{ + hint = PskIdentityHint, + dh_params = #server_dh_params{dh_p = P, dh_g = G, dh_y = Y}}) -> + Len = byte_size(PskIdentityHint), + PLen = byte_size(P), + GLen = byte_size(G), + YLen = byte_size(Y), + <<?UINT16(Len), PskIdentityHint/binary, + ?UINT16(PLen), P/binary, ?UINT16(GLen), G/binary, ?UINT16(YLen), Y/binary>>; +encode_server_key(#server_srp_params{srp_n = N, srp_g = G, srp_s = S, srp_b = B}) -> + NLen = byte_size(N), + GLen = byte_size(G), + SLen = byte_size(S), + BLen = byte_size(B), + <<?UINT16(NLen), N/binary, ?UINT16(GLen), G/binary, + ?BYTE(SLen), S/binary, ?UINT16(BLen), B/binary>>. + +encode_client_key(#encrypted_premaster_secret{premaster_secret = PKEPMS},{3, 0}) -> + PKEPMS; +encode_client_key(#encrypted_premaster_secret{premaster_secret = PKEPMS}, _) -> + PKEPMSLen = byte_size(PKEPMS), + <<?UINT16(PKEPMSLen), PKEPMS/binary>>; +encode_client_key(#client_diffie_hellman_public{dh_public = DHPublic}, _) -> + Len = byte_size(DHPublic), + <<?UINT16(Len), DHPublic/binary>>; +encode_client_key(#client_ec_diffie_hellman_public{dh_public = DHPublic}, _) -> + Len = byte_size(DHPublic), + <<?BYTE(Len), DHPublic/binary>>; +encode_client_key(#client_psk_identity{identity = undefined}, _) -> + Id = <<"psk_identity">>, + Len = byte_size(Id), + <<?UINT16(Len), Id/binary>>; +encode_client_key(#client_psk_identity{identity = Id}, _) -> + Len = byte_size(Id), + <<?UINT16(Len), Id/binary>>; +encode_client_key(Identity = #client_dhe_psk_identity{identity = undefined}, Version) -> + encode_client_key(Identity#client_dhe_psk_identity{identity = <<"psk_identity">>}, Version); +encode_client_key(#client_dhe_psk_identity{identity = Id, dh_public = DHPublic}, _) -> + Len = byte_size(Id), + DHLen = byte_size(DHPublic), + <<?UINT16(Len), Id/binary, ?UINT16(DHLen), DHPublic/binary>>; +encode_client_key(Identity = #client_rsa_psk_identity{identity = undefined}, Version) -> + encode_client_key(Identity#client_rsa_psk_identity{identity = <<"psk_identity">>}, Version); +encode_client_key(#client_rsa_psk_identity{identity = Id, exchange_keys = ExchangeKeys}, Version) -> + EncPMS = encode_client_key(ExchangeKeys, Version), + Len = byte_size(Id), + <<?UINT16(Len), Id/binary, EncPMS/binary>>; +encode_client_key(#client_srp_public{srp_a = A}, _) -> + Len = byte_size(A), + <<?UINT16(Len), A/binary>>. + +enc_sign({_, anon}, _Sign, _Version) -> + <<>>; +enc_sign({HashAlg, SignAlg}, Signature, _Version = {Major, Minor}) + when Major == 3, Minor >= 3-> + SignLen = byte_size(Signature), + HashSign = enc_hashsign(HashAlg, SignAlg), + <<HashSign/binary, ?UINT16(SignLen), Signature/binary>>; +enc_sign(_HashSign, Sign, _Version) -> + SignLen = byte_size(Sign), + <<?UINT16(SignLen), Sign/binary>>. + +enc_hashsign(HashAlgo, SignAlgo) -> + Hash = ssl_cipher:hash_algorithm(HashAlgo), + Sign = ssl_cipher:sign_algorithm(SignAlgo), + <<?BYTE(Hash), ?BYTE(Sign)>>. + +encode_protocol(Protocol, Acc) -> + Len = byte_size(Protocol), + <<Acc/binary, ?BYTE(Len), Protocol/binary>>. + +dec_client_key(PKEPMS, ?KEY_EXCHANGE_RSA, {3, 0}) -> + #encrypted_premaster_secret{premaster_secret = PKEPMS}; +dec_client_key(<<?UINT16(_), PKEPMS/binary>>, ?KEY_EXCHANGE_RSA, _) -> + #encrypted_premaster_secret{premaster_secret = PKEPMS}; +dec_client_key(<<>>, ?KEY_EXCHANGE_DIFFIE_HELLMAN, _) -> + throw(?ALERT_REC(?FATAL, ?UNSUPPORTED_CERTIFICATE)); +dec_client_key(<<?UINT16(DH_YLen), DH_Y:DH_YLen/binary>>, + ?KEY_EXCHANGE_DIFFIE_HELLMAN, _) -> + #client_diffie_hellman_public{dh_public = DH_Y}; +dec_client_key(<<>>, ?KEY_EXCHANGE_EC_DIFFIE_HELLMAN, _) -> + throw(?ALERT_REC(?FATAL, ?UNSUPPORTED_CERTIFICATE)); +dec_client_key(<<?BYTE(DH_YLen), DH_Y:DH_YLen/binary>>, + ?KEY_EXCHANGE_EC_DIFFIE_HELLMAN, _) -> + #client_ec_diffie_hellman_public{dh_public = DH_Y}; +dec_client_key(<<?UINT16(Len), Id:Len/binary>>, + ?KEY_EXCHANGE_PSK, _) -> + #client_psk_identity{identity = Id}; +dec_client_key(<<?UINT16(Len), Id:Len/binary, + ?UINT16(DH_YLen), DH_Y:DH_YLen/binary>>, + ?KEY_EXCHANGE_DHE_PSK, _) -> + #client_dhe_psk_identity{identity = Id, dh_public = DH_Y}; +dec_client_key(<<?UINT16(Len), Id:Len/binary, PKEPMS/binary>>, + ?KEY_EXCHANGE_RSA_PSK, {3, 0}) -> + #client_rsa_psk_identity{identity = Id, + exchange_keys = #encrypted_premaster_secret{premaster_secret = PKEPMS}}; +dec_client_key(<<?UINT16(Len), Id:Len/binary, ?UINT16(_), PKEPMS/binary>>, + ?KEY_EXCHANGE_RSA_PSK, _) -> + #client_rsa_psk_identity{identity = Id, + exchange_keys = #encrypted_premaster_secret{premaster_secret = PKEPMS}}; +dec_client_key(<<?UINT16(ALen), A:ALen/binary>>, + ?KEY_EXCHANGE_SRP, _) -> + #client_srp_public{srp_a = A}. + +dec_server_key_params(Len, Keys, Version) -> + <<Params:Len/bytes, Signature/binary>> = Keys, + dec_server_key_signature(Params, Signature, Version). + +dec_server_key_signature(Params, <<?BYTE(HashAlgo), ?BYTE(SignAlgo), + ?UINT16(0)>>, {Major, Minor}) + when Major == 3, Minor >= 3 -> + HashSign = {ssl_cipher:hash_algorithm(HashAlgo), ssl_cipher:sign_algorithm(SignAlgo)}, + {Params, HashSign, <<>>}; +dec_server_key_signature(Params, <<?BYTE(HashAlgo), ?BYTE(SignAlgo), + ?UINT16(Len), Signature:Len/binary>>, {Major, Minor}) + when Major == 3, Minor >= 3 -> + HashSign = {ssl_cipher:hash_algorithm(HashAlgo), ssl_cipher:sign_algorithm(SignAlgo)}, + {Params, HashSign, Signature}; +dec_server_key_signature(Params, <<>>, _) -> + {Params, {null, anon}, <<>>}; +dec_server_key_signature(Params, <<?UINT16(0)>>, _) -> + {Params, {null, anon}, <<>>}; +dec_server_key_signature(Params, <<?UINT16(Len), Signature:Len/binary>>, _) -> + {Params, undefined, Signature}; +dec_server_key_signature(_, _, _) -> + throw(?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE)). + + +dec_hello_extensions(<<>>, Acc) -> + Acc; +dec_hello_extensions(<<?UINT16(?NEXTPROTONEG_EXT), ?UINT16(Len), ExtensionData:Len/binary, + Rest/binary>>, Acc) -> + dec_hello_extensions(Rest, + Acc#hello_extensions{next_protocol_negotiation = + #next_protocol_negotiation{extension_data = ExtensionData}}); +dec_hello_extensions(<<?UINT16(?RENEGOTIATION_EXT), ?UINT16(Len), Info:Len/binary, Rest/binary>>, Acc) -> + RenegotiateInfo = case Len of + 1 -> % Initial handshake + Info; % should be <<0>> will be matched in handle_renegotiation_info + _ -> + VerifyLen = Len - 1, + <<?BYTE(VerifyLen), VerifyInfo/binary>> = Info, + VerifyInfo + end, + dec_hello_extensions(Rest, + Acc#hello_extensions{renegotiation_info = + #renegotiation_info{renegotiated_connection = RenegotiateInfo}}); + +dec_hello_extensions(<<?UINT16(?SRP_EXT), ?UINT16(Len), ?BYTE(SRPLen), SRP:SRPLen/binary, Rest/binary>>, Acc) + when Len == SRPLen + 2 -> + dec_hello_extensions(Rest, Acc#hello_extensions{srp = #srp{username = SRP}}); + +dec_hello_extensions(<<?UINT16(?SIGNATURE_ALGORITHMS_EXT), ?UINT16(Len), + ExtData:Len/binary, Rest/binary>>, Acc) -> + SignAlgoListLen = Len - 2, + <<?UINT16(SignAlgoListLen), SignAlgoList/binary>> = ExtData, + HashSignAlgos = [{ssl_cipher:hash_algorithm(Hash), ssl_cipher:sign_algorithm(Sign)} || + <<?BYTE(Hash), ?BYTE(Sign)>> <= SignAlgoList], + dec_hello_extensions(Rest, Acc#hello_extensions{hash_signs = + #hash_sign_algos{hash_sign_algos = HashSignAlgos}}); + +dec_hello_extensions(<<?UINT16(?ELLIPTIC_CURVES_EXT), ?UINT16(Len), + ExtData:Len/binary, Rest/binary>>, Acc) -> + EllipticCurveListLen = Len - 2, + <<?UINT16(EllipticCurveListLen), EllipticCurveList/binary>> = ExtData, + EllipticCurves = [tls_v1:enum_to_oid(X) || <<X:16>> <= EllipticCurveList], + dec_hello_extensions(Rest, Acc#hello_extensions{elliptic_curves = + #elliptic_curves{elliptic_curve_list = + EllipticCurves}}); +dec_hello_extensions(<<?UINT16(?EC_POINT_FORMATS_EXT), ?UINT16(Len), ?BYTE(_), + ExtData:Len/binary, Rest/binary>>, Acc) -> + %%ECPointFormatListLen = Len - 1, + <<?BYTE(_), ECPointFormatList/binary>> = ExtData, + ECPointFormats = binary_to_list(ECPointFormatList), + dec_hello_extensions(Rest, + Acc#hello_extensions{ec_point_formats = + #ec_point_formats{ec_point_format_list = ECPointFormats}}); + +%% Ignore data following the ClientHello (i.e., +%% extensions) if not understood. + +dec_hello_extensions(<<?UINT16(_), ?UINT16(Len), _Unknown:Len/binary, Rest/binary>>, Acc) -> + dec_hello_extensions(Rest, Acc); +%% This theoretically should not happen if the protocol is followed, but if it does it is ignored. +dec_hello_extensions(_, Acc) -> + Acc. + +dec_hashsign(<<?BYTE(HashAlgo), ?BYTE(SignAlgo)>>) -> + {ssl_cipher:hash_algorithm(HashAlgo), ssl_cipher:sign_algorithm(SignAlgo)}. + +decode_next_protocols({next_protocol_negotiation, Protocols}) -> + decode_next_protocols(Protocols, []). +decode_next_protocols(<<>>, Acc) -> + lists:reverse(Acc); +decode_next_protocols(<<?BYTE(Len), Protocol:Len/binary, Rest/binary>>, Acc) -> + case Len of + 0 -> + {error, invalid_next_protocols}; + _ -> + decode_next_protocols(Rest, [Protocol|Acc]) + end; +decode_next_protocols(_Bytes, _Acc) -> + {error, invalid_next_protocols}. + +%% encode/decode stream of certificate data to/from list of certificate data +certs_to_list(ASN1Certs) -> + certs_to_list(ASN1Certs, []). + +certs_to_list(<<?UINT24(CertLen), Cert:CertLen/binary, Rest/binary>>, Acc) -> + certs_to_list(Rest, [Cert | Acc]); +certs_to_list(<<>>, Acc) -> + lists:reverse(Acc, []). + +certs_from_list(ACList) -> + list_to_binary([begin + CertLen = byte_size(Cert), + <<?UINT24(CertLen), Cert/binary>> + end || Cert <- ACList]). +from_3bytes(Bin3) -> + from_3bytes(Bin3, []). + +from_3bytes(<<>>, Acc) -> + lists:reverse(Acc); +from_3bytes(<<?UINT24(N), Rest/binary>>, Acc) -> + from_3bytes(Rest, [?uint16(N) | Acc]). + +from_2bytes(Bin2) -> + from_2bytes(Bin2, []). + +from_2bytes(<<>>, Acc) -> + lists:reverse(Acc); +from_2bytes(<<?UINT16(N), Rest/binary>>, Acc) -> + from_2bytes(Rest, [?uint16(N) | Acc]). +key_exchange_alg(rsa) -> + ?KEY_EXCHANGE_RSA; +key_exchange_alg(Alg) when Alg == dhe_rsa; Alg == dhe_dss; + Alg == dh_dss; Alg == dh_rsa; Alg == dh_anon -> + ?KEY_EXCHANGE_DIFFIE_HELLMAN; +key_exchange_alg(Alg) when Alg == ecdhe_rsa; Alg == ecdh_rsa; + Alg == ecdhe_ecdsa; Alg == ecdh_ecdsa; + Alg == ecdh_anon -> + ?KEY_EXCHANGE_EC_DIFFIE_HELLMAN; +key_exchange_alg(psk) -> + ?KEY_EXCHANGE_PSK; +key_exchange_alg(dhe_psk) -> + ?KEY_EXCHANGE_DHE_PSK; +key_exchange_alg(rsa_psk) -> + ?KEY_EXCHANGE_RSA_PSK; +key_exchange_alg(Alg) + when Alg == srp_rsa; Alg == srp_dss; Alg == srp_anon -> + ?KEY_EXCHANGE_SRP; +key_exchange_alg(_) -> + ?NULL. + +%%-------------Extension handling -------------------------------- + +handle_next_protocol(undefined, + _NextProtocolSelector, _Renegotiating) -> + undefined; + +handle_next_protocol(#next_protocol_negotiation{} = NextProtocols, + NextProtocolSelector, Renegotiating) -> + + case next_protocol_extension_allowed(NextProtocolSelector, Renegotiating) of + true -> + select_next_protocol(decode_next_protocols(NextProtocols), NextProtocolSelector); + false -> + ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE) % unexpected next protocol extension + end. + + +handle_next_protocol_extension(NextProtocolNegotiation, Renegotiation, SslOpts)-> + case handle_next_protocol_on_server(NextProtocolNegotiation, Renegotiation, SslOpts) of + #alert{} = Alert -> + Alert; + ProtocolsToAdvertise -> + ProtocolsToAdvertise + end. + +handle_next_protocol_on_server(undefined, _Renegotiation, _SslOpts) -> + undefined; + +handle_next_protocol_on_server(#next_protocol_negotiation{extension_data = <<>>}, + false, #ssl_options{next_protocols_advertised = Protocols}) -> + Protocols; + +handle_next_protocol_on_server(_Hello, _Renegotiation, _SSLOpts) -> + ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE). % unexpected next protocol extension + +next_protocol_extension_allowed(NextProtocolSelector, Renegotiating) -> + NextProtocolSelector =/= undefined andalso not Renegotiating. + +select_next_protocol({error, _Reason}, _NextProtocolSelector) -> + ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE); +select_next_protocol(Protocols, NextProtocolSelector) -> + case NextProtocolSelector(Protocols) of + ?NO_PROTOCOL -> + ?ALERT_REC(?FATAL, ?HANDSHAKE_FAILURE); + Protocol when is_binary(Protocol) -> + Protocol + end. + +handle_srp_extension(undefined, Session) -> + Session; +handle_srp_extension(#srp{username = Username}, Session) -> + Session#session{srp_username = Username}. + +%%-------------Misc -------------------------------- + +select_cipher_suite([], _) -> + no_suite; +select_cipher_suite([Suite | ClientSuites], SupportedSuites) -> + case is_member(Suite, SupportedSuites) of + true -> + Suite; + false -> + select_cipher_suite(ClientSuites, SupportedSuites) + end. + +int_to_bin(I) -> + L = (length(integer_to_list(I, 16)) + 1) div 2, + <<I:(L*8)>>. + +is_member(Suite, SupportedSuites) -> + lists:member(Suite, SupportedSuites). + +select_compression(_CompressionMetodes) -> + ?NULL. |